Updating fanart tvdb scraper

Whenever I want to change my fanart for a tv-show that was scraped using the tvdb-scraper, I notice that I can only choose from fanart scraped at the time I added the show. For instance, there's some new heroes-fanart available at thetvdb.com, however, unless I totally refresh that tv-show, I cannot get the latest (or newest) fanart. But if I do that, my watched/unwatched marks are gone, and it just takes too much time. Just to get some new fanart.

Maybe it's just me though, I'm on a 1.1 xbox using a pimped build of 08-13. But I cant imagine that would be the problem, since fanart for tv-shows has been around for a while. any thoughts on this? thanks.